Rotary cutter



3&1

R. E. FOOTE.

ROTARY CUTTER.

APPLICATION FILED.DEC.I0, 1919.

Patented Apr. 4, 1922.

A! Hu -52 w UNITED STATES PATENT OFFICE."

aonnn'r 3. room, or HARVEY, rnnmors, AssIGNoR 'ro SCULLY, JONES a'ooL, or

o rIoAeo, rnnmols, A oonronn'rron or ILLINOIS.

RQTARY ou'r'rEB.

' SPQ' fl t-MP of L t Patent Patented Apr. 4, 1922.

Apmic im ee Me vyn 9,71,919. Seria no. ma

To all whom it may concerm Be it known hat. I, RO ERT E. F 1, a eitizx n. of t U ited States, r d g a Har ey J11 the ounty of Co l; an State Of Illinois, have invented a certainnew and us fu lmpr remeet in Rot ry Cu r of which the following a full, clear, concise, and. exa de crip n. efe e e n had to the a c mpany ng drawings rmin part of this specification.

The present invention relates to improvements in rotary tools, and has particular reference to an improvement in rotary keyway cutters, whereby to enhance the efficiency of the same without material increase in cost, and to render the operation of the cutter more positive and to more securely support the same in a chuck.

While I shall describe my invention as particularly adapted to that cutter known, on the market, as the Woodrufi' cutter, I, of course, do not limit myself to its use in that connection. When the Woodrufi' cutter is used for cutting key-ways in shafts, the

cutter has been in the past supported in a" chuck, the body of the cutter being made cylindrical throughout. Great difliculty has been experienced in the use of this'cutter, owing to the lack of some effective means for firmly gripping the cutter in the chuck against relative rotation therein.

Chucks of ample strength and rigidity for holding tools subjected to continuous load symmetrically disposed about the axis of rotation, are found entirely unsuited for holding at milling cutter subjected to a rapid succession of heavy blows acting along a line offset from the axis of the tool, so as to bend the tool as well as twist it.

With the disadvantages of the cutter as now placed upon the market in mind, I have designed the present improvement with a view to affording a simple, and economic construction of the cutter whereby a positive rotation may beapplied thereto, particularly to avoid sticking of the cutter during the functioning of the same. I also have in mind improving the Voodrufl' cutter whereby the same may be used in combination with the tapered sleeves of my prior patent, issued January 1, 1918, No. 1,252,335.

Other objects and advantages to be derived from the improvement of my present invention will appear from the following detail description and the claims, taken in in, which: g g

F gure 1 1s a longitudinal sectional View 131 igure 2 is an elevation of the improved too i 1 Referring more particularly to the draw- 'i ng, 1 designates the spindle ofQa machine, which may be a suitable machine f or cutting ke ewaysor. the like. The spindle is rovi ed with a tapered socket 2 and. a transverse slot 3. A tapered sleeve 4, similar in all respects to the sleeve disclosed in my prior patent above referred to, is mounted in the tapered slot 2 and is provided with the bore 5 and counterbore 6. The counterbore is formed with a squared portion 7, similarly to the tapered sleeve of my prior patent. The rear end of the sleeve is flattened as at 8 for engagement in the slot 3 so that the sleeve will be turned positively with the spindle 1. The tapered sleeve 4 is slotted as at 9, to form jaws. v

The device of my invention comprises the body portion 10, which is usually cylindrical,

the reduced extension 11, and the cutting element 12 carried thereby. The rear end ofthe tool is, in the present instance, shown squared as at 13, for reception in the squared portion '7 of the counterbore 6 in the sleeve 4.

By squaring the rearend of the tool 10 a firm engagement thereof with the rotating part of the drive element is assured, so that the cutter cannot stick, in the metal being worked, or rotate in the tapered sleeve.

I lay particular stress upon theapplication of the squared end to a Woodrufi' cutter, as extreme difficulty has been encountered heretofore in the art in maintaining the cutter rigid in the spindle or chuck. Of course, it is to be understood that the end of the tool need not be squared, but may be flattened, or may be polygonal in shape in order to suit various shapes of openings which might be made in the sleeve 4.

The tool may as readily be applied to other types of sleeves or chucks than that shown, but has been found to be particularly eflicient in the combination shown.

' connection with the accompanying dpawing,

I do not limit myself to the details as cutting operation, to loads asymmetrical with respect to the axis of rotatiom-said cutter having a cylindrical shank for support and guidance thereof, and a squared end for positively transmitting thereto.

- 2. In combination with a rotating cutter subjected during the cutting operation to loads asymmetrical with respect to the axis torque.

and a resilient portion, said resilient portion comprising sectors adapted to receiveand grip the shank of said cutter, and a tapered 7 socket receiving and supporting said sleeve .by gripping engagement with its resilient portion only.

4. In combination with a rotatingcutter subjected during the cutting operation to intermittentloads asymmetrical with respect to the axis of rotation, a sleeve having resilient sectors for gripping the shank of said cutter, and a tapered socket receiving said sleeve, said sleeve and" socket having gripping engagement with each other only throughout a relatively small portion of the length of said sleeve, immediately adjacent the" shank of said cutter;

In witness whereof I hereunto-subscribe my name this 6th day of Decembe1 t1 1 ROBERT E. FooTE; 

